Kohji Matsumoto and Yumiko Umegaki, Asymptotic formulas for the logarithm of general L-functions at and near s=1, preprint, arXiv:2401.17610
Philippe Lebacque, Kohji Matsumoto, Masahiro Mine and Yumiko Umegaki, On the value distribution of the logarithms of symmetric power L-functions in the level aspect, preprint, arXiv:2209.11918.
Kohji Matsumoto and Yumiko Umegaki, On the value-distribution of symmetric power L-functions, in "Topics in Number Theory : On the Occasion of the 130th Birth Anniversary of Srinivasa Ramanujan", Ramanujan Mathematical Society Lecture Notes Series, vol. 26, Ramanujan Mathematical Society, 2020., 147--167.
Atsuki Umegaki and Yumiko Umegaki, Quatic number fields with large class numbers, Rocky Mountain J. Math. 50 (2020), No. 1, 267--280.
Kohji Matsumoto and Yumiko Umegaki, On the density function for the value-distribution of automorphic L-functions, Journal of Number Theory 198 (2019) 176--199.
Yasuko Morita, Atsuki Umegaki and Yumiko Umegaki, Bicubic number fields with large class numbers, Various Aspects of Multiple Zeta Functions (in honor of Professor Kohji Matsumoto's 60th birthday) 335--351, Adv. Stud. Pure Math. 84, Math. Soc. Japan, Tokyo, 2020.
Kohji Matsumoto and Yumiko Umegaki, On the value-distribution of the difference between logarithms of two symmetric power L-functions, Int. J. Number Theory 14 (2018), no. 7, 2045--2081.
Yumiko Ichihara, The first moment of L-functions of primitive forms on $\Gamma_0(p^{\alpha})$ and a basis of old forms, Journal of Number Theory vol. 131, no. 2 (2011) 343-362.
Yumiko Ichihara, Estimates of a certain sum involving coefficients of cusp forms in weight and level aspects, Lithuanian Math. J. vol.48, no. 2 (2008) 188--202.
Yumiko Ichihara and Kohji Matsumoto, On the Siegel-Tatuzawa theorem for a class of L-functions, Kyushu J. Math., vol.62 (2008), 201--215.
Yumiko Ichihara, The evaluation of the sum over arithmetic progressions for the coefficients of the Rankin-Selberg series II, Analytic Number Theory (Beijing/Kyoto, 1999), 173--182, Dev. Math., 6, Kluwer Acad. Publ., Dordrecht,2002
Yumiko Ichihara, The evaluation of the sum over arithmetic progressions for the coefficients of the Rankin-Selberg series, Japan. J. Math. 29 (2003), no.2, 297--314.
Yumiko Ichihara, On Riesz mean for the coefficients of the twisted Rankin-Selberg L-functions, J. Math. Soc. Japan 55 (2003), no.1, 81--100
Yumiko Ichihara, The Siegel-Walfisz theorem for Rankin-Selberg L-functions associated with two cusp forms, Acta Arith. 92 (2000), no. 3, 215--227.
Publications（数理解析研究所講究録）
松本耕二・梅垣由美子，On the value-distribution of the difference between logarithms of two symmetric power L-functions, 講究録 2203 (2021) 159--170.
市原由美子，Non-vanishing of the value of L-functions attached to primitive forms at a fixed point on the critical line, 講究録 1710 (2010) 29--41.
市原由美子，Euler 積で定義される L 関数の Siegel-Tatuzawa の定理について, 講究録 1511 (2006) 74--81.
市原由美子，Hilbert cusp form に付随する L 関数の収束性, 講究録 1384 (2004) 37--41.
市原由美子，Rankin-Selberg L 関数の zero-free region --- Siegel-Tatuzawa 型の定理について ---, 講究録 1274 (2002) 53--61.
市原由美子，On Riesz mean for the coefficients of the twisted Rankin-Selberg L-function, 講究録 1219 (2001) 235--244.
市原由美子，The evaluation of the sum over arithmetic progressions for the coefficients of the Rankin-Selberg series, 講究録 1160 (2000) 110--118.
市原由美子，2 つの cusp form の Fourier 係数の積に対する算術級数の素数定理と Rankin-Selberg L 関数の zero-free region, 講究録 1091 (1999) 27--35.